When Mary stood up to answer the question she was at first but soon relaxed.A. nervousB.

问题补充：

When Mary stood up to answer the question , she was at first but soon relaxed.

A. nervous

B. happy

C. mad

D. athletic

答案：

(答案→)A. nervous

B. happy

C. mad

D. athletic

解析：nervous 紧张的；happy高兴的； mad疯狂的；athletic健壮的。句意：当玛丽站起来回答问题时，开始她很紧张，但是很快就放松了。故选A。